EP1810289A1 - Optical pickup unit and information recording apparatus using the same - Google Patents
Optical pickup unit and information recording apparatus using the sameInfo
- Publication number
- EP1810289A1 EP1810289A1 EP05795180A EP05795180A EP1810289A1 EP 1810289 A1 EP1810289 A1 EP 1810289A1 EP 05795180 A EP05795180 A EP 05795180A EP 05795180 A EP05795180 A EP 05795180A EP 1810289 A1 EP1810289 A1 EP 1810289A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light beam
- focused
- sub
- light beams
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
- G11B7/0903—Multi-beam tracking systems
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
Definitions
- the present invention relates generally to optical pickup units and information recording apparatuses, and more particularly to an optical pickup unit recording information on and reproducing information from the recording surface of a multilayer information recording medium using the differential push-pull method detecting and controlling the position of an emitted light beam, and an information recording apparatus using the same.
- a main light beam is emitted from a light source onto the recording surface of an information recording medium having guide grooves (information tracks) on which the information is recorded, so that information is recorded on the information recording medium or information is reproduced from the information recording medium based on light reflected from the recording surface.
- the information recording apparatus includes an optical pickup unit for emitting the main light beam on the recording surface of the information recording medium and receiving light reflected from the recording surface.
- the optical pickup unit includes a light source 11, an optical system including an objective lens 16, and a divided light receiving element 19.
- the optical system further includes a coupling lens 12, a beam splitter 14, and a deflection mirror 15.
- the optical system guides a light beam emitted from the light source 11 to the recording surface of an information recording medium 18 and guides a returning light beam reflected from the recording surface to a predetermined light-receiving position, where the divided light receiving element 19 is disposed.
- the divided light receiving element 19 outputs not only the reproduced information of data recorded on the recording surface but also signals including information necessary for controlling the positions of the optical pickup unit itself and the objective lens 16. These signals are fed back so as to control their positions, so that driving control is performed by a lens actuator 17.
- a so-called push- pull method is widely used as a method of detecting the position of the main light beam on the recording surface from a returning light beam reflected from the recording surface.
- a so-called push- pull method is widely used.
- a light beam emitted from a light source is split into one main light beam 1 and two sub light beams 2, so that the main light beam 1 and each of the sub light beams 2 are offset from each other radially on the recording surface by half a track pitch.
- the returning light beams of the main light beam 1 and the two sub light beams 2 reflected from the recording surface are received by three divided light receiving elements 19a through 19c, respectively, shown in FIG. 3.
- Each of the divided light receiving elements 19a through 19c is divided into two parts.
- a push-pull signal is obtained from each of the divided light receiving elements 19a through 19c.
- the reflectivity of the guide grooves varies. Therefore, as shown in FIG. 4A, in recording information on the information recording medium in a direction from the center to the periphery thereof, disposing a first sub light beam 2a and a second sub light beam 2b so that the first sub light beam 2a leads the main light beam 1 on its inner side and the second sub light beam 2b trails the main light beam 1 on its outer side in the optical disk scanning direction causes an offset in the differential push-pull signal due to the difference in reflectivity between an unrecorded part 4 and a recorded part 5. Therefore, according to Japanese Laid-Open Patent Application No. 2004-164720, as shown in FIG.
- the first and second sub light beams 2a and 2b are disposed so that the first sub light beam 2a leads the main light beam 1 on its outer side and the second sub light beam 2b trails the main light beam 1 on its inner side in the optical disk scanning direction, thereby eliminating the effect of the difference in reflectivity in each of the first and second sub light beams 2a and 2b and thus reducing an offset in the differential push-pull signal.
- Multilayer information recording media are employed as means for increasing the capacity of information recording media.
- those put to practical use at present include DVD+R double layer (DL) disks and DVD-ROM double layer (DL) disks.
- FIG. 5 shows a structure of the DVD+R DL disk.
- the DVD+R DL disk includes a substrate 0 layer, a dye 0 layer, a translucent film, an intermediate layer, a dye 1 layer, a reflection film, and a substrate 1 layer that are stacked in the order described from the light incidence (objective lens) side.
- Signal information is recorded as variations in refractive index on a guide groove from the dye 0 layer to the dye 1 layer.
- polycarbonate may be used for the substrate 0 layer and the substrate 1 layer
- a UV cure or thermosetting resin may be used for the intermediate layer.
- Silicon, silver, or aluminum may be used for the translucent film, and silver or aluminum may be used for the reflection film.
- the guide groove is formed spirally on each recording surface.
- the direction of the spiral differs between an LO layer on the objective lens side and an Ll layer on the other side of the LO layer from the objective lens.
- This structure where the direction of the spiral of the guide groove differs between the LO layer and the Ll layer is referred to as "Opposite Track Path (OTP) .
- OTP Opposite Track Path
- FIG. 6A shows a conventional disposition of the main light beam 1 and the sub light beams 2a and 2b in the case of recording information on the DVD+R DL disk.
- recording information in the LO layer an excellent push-pull signal can be obtained with the above-described technique disclosed in Japanese Laid-Open Patent Application No. 2004-164720 since there is no difference in reflectivity in each of the sub light beams 2a and 2b.
- the area of the recorded part 5 is reversed as shown in FIG. 6B.
- a more specific object of the present invention is to provide an optical pickup unit capable of obtaining excellent sub light beam signals from a multilayer information recording medium in which the direction of the spiral of a guide groove is different on each recording surface, and recording information on and reproducing information from the recording medium using stable signals such as a differential push-pull signal and a lens position signal obtained from the excellent sub light beam signals.
- Another more specific object of the present invention is to provide an information recording apparatus using the optical pickup unit.
- an optical pickup unit for recording information on and/or reproducing information from a multilayer information recording medium including a plurality of recording surfaces in each of which a guide groove serving as an information track on which the information is to be recorded is spirally formed, wherein a direction of a spiral of the guide groove alternates between the recording surfaces
- the optical pickup unit including: a light source emitting a light beam; a diffraction element configured to split the light beam emitted from the light source into a main light beam and first and second sub light beams; an objective lens for focusing the main light beam and the first and second sub light beams onto one of the recording surfaces of the multilayer information recording medium; and a plurality of light receiving elements each divided into a plurality of light receiving parts shaped in any manner so as to receive the main light beam and the first and second sub light beams reflected from the one of the recording surfaces, wherein the focused first and second sub light beams are disposed at respective positions at least 3/2 tracks away from the focused main light
- each sub light beam is disposed in the area of a recorded part where information has been recorded by a main light beam or in the area of an unrecorded part on a recording surface of a multilayer information recording medium. Accordingly, it is possible to obtain an excellent signal without a difference in reflectivity in each sub light beam.
- an information recording apparatus including an optical pickup unit according to the present invention; a signal processing part configured to generate, based on signals from the light receiving elements of the optical pickup unit, a main push-pull signal, which is a tracking error signal of the main light beam, a first tracking error signal of the first sub light beam, and a second tracking error signal of the second sub light beam; generate a sub push-pull signal by calculating a sum of the first and second tracking error signals; and generate a differential push-pull signal by calculating a difference between the main push-pull signal and the sub push-pull signal multiplied by a correction factor; a track controller configured to control the objective lens in a track direction based on the differential push-pull signal; and a driver configured to drive the objective lens.
- a main push-pull signal which is a tracking error signal of the main light beam, a first tracking error signal of the first sub light beam, and a second tracking error signal of the second sub light beam
- generate a sub push-pull signal by calculating
- tracking control can be performed stably on each recording surface of a multilayer information recording medium in which the direction of the spiral of a guide groove is different in each recording surface.
- an information recording apparatus including: an optical pickup unit according to the present invention; a signal processing part configured to generate, based on signals from the light receiving elements of the optical pickup unit, a main push-pull signal, which is a tracking error signal of the main light beam, a first tracking error signal of the first sub light beam, and a second tracking error signal of the second sub light beam; generate a sub push-pull signal by calculating a sum of the first and second tracking error signals; and generate a lens position signal by calculating a sum of the main push-pull signal and the sub push-pull signal multiplied by a correction factor; a lens controller configured to correct a shifting of the objective lens based on the lens position signal; and a driver configured to drive the objective lens.
- a main push-pull signal which is a tracking error signal of the main light beam, a first tracking error signal of the first sub light beam, and a second tracking error signal of the second sub light beam
- generate a sub push-pull signal by calculating a sum of the first and
- the present invention with respect to a multilayer information recording medium in which the direction of the spiral of a groove is different in each of its recording surfaces, excellent sub light beam signals may be obtained with respect to each recording surface. Further, an excellent differential push-pull signal, lens position signal, and track cross signal without an offset may be obtained with respect to each recording surface during recording even if there is a difference in reflectivity between an unrecorded part and a recorded part. As a result, it is possible to perform excellent control of the position of an objective lens so that information can be stably recorded on and reproduced from the multilayer information recording medium with accuracy.
- FIG. 1 is a schematic diagram showing a conventional optical pickup unit
- FIG. 2 is a diagram showing a conventional disposition of a main light beam and sub light beams focused onto a recording surface
- FIG. 3 is a circuit diagram showing three light receiving elements each divided in two parts for receiving the main light beam and the sub light beams shown in FIG. 2 and a signal calculator;
- FIGS. 4A and 4B are diagrams each showing a conventional disposition of the main light beam and the sub light beams focused onto the recording surface of an information recording medium;
- FIG. 5 is a diagram showing a structure of a multilayer information recording medium (double layer disk) ;
- FIGS. 6A and 6B are diagrams each showing a conventional disposition of the main light beam and the sub light beams focused onto a recording surface of the multilayer information recording medium (double layer disk) ;
- FIGS. 7A and 7B are diagrams each showing a disposition of the main light beam and the sub light beams focused onto a recording surface of the multilayer information recording medium (double layer disk) according to a first embodiment of the present invention;
- FIG. 8 is a diagram for illustrating the positional relationship between the main light beam and the sub light beams according to the first embodiment of the present invention;
- FIG. 9 is a schematic diagram showing an optical pickup unit according to the first embodiment of the present invention.
- FIG. 10 is a circuit diagram showing the three light receiving elements each divided in two parts for receiving the main light beam and the sub light beams and a signal calculator according to the first embodiment of the present invention.
- FIG. 11 is a block diagram showing an information recording apparatus according to a second embodiment of the present invention.
- FIGS. 7A and 7B are diagrams each showing a disposition of the main light beam 1 and the sub light beams 2a and 2b focused onto a recording surface of a multilayer information recording medium (a double layer disk) according to a first embodiment of the present invention.
- FIG. 7A shows a state where each of the beams 1, 2a, and 2b is focused onto the recording surface (LO layer, FIG. 5) on the objective lens side.
- information is recorded on the recording surface in a direction from the center to the periphery of the disk.
- the double layer disk rotates about the disk center.
- the double layer disk rotates clockwise so that the recording surface is scanned counterclockwise by the beams 1, 2a, and 2b.
- the recorded part 5 is formed on the center (inner) side and the trailing (rear) side of the main light beam 1 in the optical disk scanning direction.
- the data is recorded on a groove. Therefore, the main light beam 1 is focused into a spot on the groove.
- the sub light beams 2a and 2b are focused into spots on corresponding lands that are 3/2 tracks (track pitches) or more away from the main light beam 1 on the periphery (outer) side and the center (inner) side, respectively, of the main light beam 1.
- the sub light beams 2a and 2b are disposed at such positions, so that the first sub light beam 2a detects the diffracted light of a groove of the unrecorded part 4 equally on its right (periphery) side and on its left (center) side and the second sub light beam 2b detects the diffracted light of a groove of the recorded part 5 equally on its right (periphery) side and on its left (center) side.
- FIG. 7B shows a state where each of the beams 1, 2a, and 2b is focused onto the recording surface (Ll layer, FIG.
- FIG. 7B information is recorded on the recording surface in a direction from the periphery to the center of the disk.
- the double layer disk rotates about the disk center.
- the double layer disk rotates clockwise so that the recording surface is scanned counterclockwise by the beams 1, 2a, and 2b. Accordingly, data is recorded (the recorded part 5 is formed) on the periphery (outer) side and the trailing (rear) side of the main light beam 1 in the optical disk scanning direction.
- the first sub light beam 2a detects the diffracted light of a groove of the recorded part 5 equally on its right (periphery) side and on its left (center) side and the second sub light beam 2b detects the diffracted light of a groove of the unrecorded part 4 equally on its right (periphery) side and on its left (center) side.
- an excellent signal is obtained in each of the sub light beams 2a and 2b without being affected by the difference in reflectivity between the unrecorded part 4 and the recorded part 5.
- the first sub light beam 2a is disposed ahead of the main light beam 1 on its periphery (outer) side and the second sub light beam 2b is disposed behind the main light beam 1 on its center (inner) side in the optical disk scanning direction.
- the first sub light beam 2a may be disposed behind the main light beam 1 on its periphery (outer) side and the second sub light beam 2b may be disposed ahead of the main light beam 1 on its center (inner) side in the optical disk scanning direction as long as each of the sub light beams 2a and 2b is 3/2 tracks or more away from the main light beam 1.
- the main light beam 1 and the sub light beams 2a and 2b are disposed so as to satisfy the following:
- n is an integer greater than or egual to one.
- 1, 2a, and 2b may be disposed so as to satisfy the following:
- the beams 1, 2a, and 2b may be disposed so as to satisfy the following:
- a signal is likely to be disturbed in the proximity of the periphery of an information recording medium because of the effect of warping of its substrate and the effect of double refraction. Accordingly, it is preferable that a sub light beam be positioned as close to a main light beam as possible on a land that is 3/2 tracks or more away from the main light beam. An excellent signal can be obtained by positioning each sub light beam on a land that is 3/2 tracks or more away from the main light beam.
- each of the sub light beams 2a and 2b be disposed on the recording surface so as to satisfy the following:
- the position of each of the sub light beams 2a and 2b is set so as to satisfy the following:
- the position of each of the sub light beams 2a and 2b is set so as to satisfy the following:
- FIG. 9 is a schematic diagram showing an optical pickup unit according to the first embodiment.
- the optical pickup unit of FIG. 9 further includes a diffraction element 13.
- a light beam emitted from the light source 11 is split into the zero-order main light beam 1 and the positive and negative first-order first and second sub light beams 2a and 2b by the diffraction element 13.
- Each of the light beams 1, 2a, and 2b is focused onto a recording surface of a double layer disk (a multilayer information recording medium) 18a by the objective lens 16.
- Each of the light beams 1, 2a, and 2b reflected from the recording surface has its optical path changed by the beam splitter 14 so as to be detected by the divided light receiving element 19.
- each of the focused sub light beams 2a and 2b on the recording surface is controlled by turning the diffraction element 13 relative to a principal plane.
- FIG. 10 shows a configuration of the divided light receiving element 19.
- the divided light receiving element 19 includes the three light receiving elements 19a through 19c, each divided into multiple parts shaped in any manner, that is, having a light receiving surface thereof divided into two parts, for receiving the main light beam, the first sub light beam, and the second sub light beam, respectively.
- the light receiving surface of the light receiving elements 19a is divided into two parts A and B, which detect the portions a and b, respectively, of the main light beam 1 focused onto the recording surface as shown in FIGS. 7A and 7B.
- the light receiving surface of the light receiving elements 19b is divided into two parts C and D, which detect the portions c and d, respectively, of the first sub light beam 2a focused onto the recording surface as shown in FIGS. 7A and 7B.
- the light receiving surface of the light receiving elements 19c is divided into two parts E and F, which detect the portions e and _f, respectively, of the second sub light beam 2b focused onto the recording surface as shown in FIGS. 7A and 7B.
- a main push-pull signal (MPP) is obtained by calculating the difference between the right and left signals in the main light beam 1 as follows:
- a first sub push-pull signal (SPPl) is obtained by calculating the difference between the right and left signals in the first sub light beam 2a as follows:
- a second sub push-pull signal (SPP2) is obtained by calculating the difference between the right and left signals in the second sub light beam 2b as follows:
- a sub push-pull signal is obtained by calculating the sum of the first sub push-pull signal (SPPl) and the second sub push-pull signal (SPP2) as follows:
- a differential push-pull signal is obtained by calculating the difference between the main push-pull signal (MPP) and the sub push-pull signal (SPP) multiplied by a correction factor K as follows:
- MPP and SPP are different in phase by 180°, and an offset due to optical axis displacement is caused in the same positive or negative direction in MPP and SPP. Accordingly, by setting the value of K to the ratio of light quantity of the main light beam 1 to the sub light beams 2a and 2b, MPP matches SPP in amplitude, so that the offset of the push-pull method due to optical axis displacement is totally canceled. This makes it possible to perform stable tracking control.
- first and second sub push-pull signals SPPl' and SPP2' at this point are given as follows:
- MPP' is a main push-pull signal corresponding to SPPl' and SPP2' .
- the sub light beams 2a and 2b is focused into a spot on the center of a corresponding land on the recording surface of the double layer disk, the following equation holds.
- the objective lens 16 shifts because of its inertia.
- the shifting of the objective lens 16 is corrected using a lens position signal (an optical axis displacement component) .
- the lens position signal is given as follows:
- MPP and SPP are different in phase by 180°, and an offset due to optical axis displacement is caused in the same positive or negative direction in MPP and SPP. Accordingly, by setting the value of K to the ratio of light quantity of the main light beam 1 to the sub light beams 2a and 2b, MPP matches SPP in amplitude. As a result, an amplitude offset is canceled, so that only the optical axis displacement component is obtained as the lens position signal, This makes it possible to control the position of the objective lens 16 with accuracy.
- the reflectivity of the second sub light beam 2b is increased because of the recorded part 5 on the recording surface. Letting the rate of increase of reflectivity at this point be r, SPPl' and SPP2' are given as follows:
- FIG. 11 is a block diagram showing an information recording apparatus according to a second embodiment of the present invention.
- the double layer disk 18a has each of its recording surfaces rotated in the same direction by a spindle (SP) motor 20.
- An optical pickup unit 10 receives a main light beam and two sub light beams reflected from the double layer disk 18a on the above-described divided light receiving surfaces A through F of the divided light receiving elements 19a through 19c (FIG. 10) .
- the received light beams are subjected to photoelectric conversion in the corresponding divided light receiving elements 19a through 19c so as to be output to a signal calculator 21.
- the outputs of the optical pickup unit 10 are converted into voltage values in I/V amplifiers 21a, and the voltage values are fed to each of a DPP calculation circuit 21b, an LP calculation circuit 21c, and a TC calculation circuit 2Id.
- the DPP calculation circuit 21b generates the above-described differential push-pull signal (DPP) .
- the LP calculation circuit 21c generates the above-described lens position signal (LP) .
- the TC calculation circuit 21d generates a track cross signal (TC) .
- These signals are fed to an objective lens controller 22 including a track controller controlling an objective lens in the track direction and a lens controller correcting the shifting of the objective lens. As a result, the objective lens is driven and controlled by a driver.
- the information recording apparatus includes a control part 30 including the objective lens controller 22, a seek motor control circuit 23, and a spindle (SP) motor control circuit 24.
- the seek motor control circuit 23 controls a seek motor 31.
- the seek motor 31 moves the optical pickup unit 10 in the radial directions of the double layer disk 18a.
- the SP motor control circuit 24 controls the spindle motor 20.
- the difference in reflectivity between an unrecorded part and a recorded part tends to be greater. This is particularly so in the case of performing recording on write-once multilayer information recording media because information is always recorded in the unrecorded part. Therefore, according to one aspect of the present invention, a more stable signal can be obtained in the case of performing recording on such multilayer information recording media.
- each sub light beam is disposed in the area of a recorded part where information has been recorded by a main light beam or in the area of an unrecorded part on a recording surface of a multilayer information recording medium. Accordingly, it is possible to obtain an excellent signal without a difference in reflectivity in each sub light beam.
- tracking control can be performed stably on each recording surface of a multilayer information recording medium in which the direction of the spiral of a guide groove is different in each recording surface.
- an optical pickup unit and an information recording apparatus using the same with respect to a multilayer information recording medium in which the direction of the spiral of a groove is different in each of its recording surfaces, excellent sub light beam signals may be obtained with respect to each recording surface. Further, an excellent differential push-pull signal, lens position signal, and track cross signal without an offset may be obtained with respect to each recording surface during recording even if there is a difference in reflectivity between an unrecorded part and a recorded part. As a result, it is possible to perform excellent control of the position of an objective lens so that information can be stably recorded on and reproduced from the multilayer information recording medium with accuracy.
- the present invention is useful for an optical pickup unit using the differential push-pull method detecting and controlling the position of a light beam emitted onto a recording surface of a multilayer information recording medium, and for an information recording apparatus using the optical pickup unit.
- the present application is based on Japanese
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Abstract
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2004302662 | 2004-10-18 | ||
JP2005063861A JP4234109B2 (en) | 2004-10-18 | 2005-03-08 | Optical pickup device and information recording device using the same |
PCT/JP2005/019153 WO2006043572A1 (en) | 2004-10-18 | 2005-10-12 | Optical pickup unit and information recording apparatus using the same |
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EP1810289A1 true EP1810289A1 (en) | 2007-07-25 |
EP1810289A4 EP1810289A4 (en) | 2008-08-20 |
EP1810289B1 EP1810289B1 (en) | 2010-04-07 |
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EP05795180A Not-in-force EP1810289B1 (en) | 2004-10-18 | 2005-10-12 | Method for recording information on and/or reproducing information from a multilayer recording medium |
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US (1) | US7751286B2 (en) |
EP (1) | EP1810289B1 (en) |
JP (1) | JP4234109B2 (en) |
KR (1) | KR100768460B1 (en) |
DE (1) | DE602005020488D1 (en) |
TW (1) | TWI314319B (en) |
WO (1) | WO2006043572A1 (en) |
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EP2054887A2 (en) | 2006-08-15 | 2009-05-06 | Koninklijke Philips Electronics N.V. | Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs |
JP4842209B2 (en) * | 2006-08-22 | 2011-12-21 | 株式会社リコー | Extraction optical system, optical pickup and optical disc apparatus |
JP5040028B2 (en) * | 2007-12-05 | 2012-10-03 | 株式会社リコー | Multilayer information recording medium / layer discrimination method |
JP5617561B2 (en) | 2010-11-25 | 2014-11-05 | 株式会社リコー | Imaging device |
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US6219316B1 (en) * | 1996-04-17 | 2001-04-17 | Deutsche Thomson-Brandt Gmbh | Recording or reproducing device for recording media having different track spacings |
EP1391884A2 (en) * | 2002-08-23 | 2004-02-25 | Matsushita Electric Industrial Co., Ltd. | Optical pick-up head, optical information apparatus, and optical information reproducing method |
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- 2005-10-12 EP EP05795180A patent/EP1810289B1/en not_active Not-in-force
- 2005-10-12 KR KR1020067011944A patent/KR100768460B1/en not_active IP Right Cessation
- 2005-10-12 WO PCT/JP2005/019153 patent/WO2006043572A1/en active Application Filing
- 2005-10-12 DE DE602005020488T patent/DE602005020488D1/en active Active
- 2005-10-17 TW TW094136213A patent/TWI314319B/en not_active IP Right Cessation
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2006
- 2006-06-15 US US11/453,066 patent/US7751286B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
TWI314319B (en) | 2009-09-01 |
TW200634788A (en) | 2006-10-01 |
EP1810289A4 (en) | 2008-08-20 |
KR20060103264A (en) | 2006-09-28 |
EP1810289B1 (en) | 2010-04-07 |
JP2006147120A (en) | 2006-06-08 |
JP4234109B2 (en) | 2009-03-04 |
WO2006043572A1 (en) | 2006-04-27 |
US20060227679A1 (en) | 2006-10-12 |
DE602005020488D1 (en) | 2010-05-20 |
KR100768460B1 (en) | 2007-10-19 |
US7751286B2 (en) | 2010-07-06 |
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